| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily maintain the balance of a mounting base by providing a floating roller for supporting an assist roller via an elastic material so as to be floatingly movable up and down and supporting the lower surface of the mounting base following the up and down movement of the assist roller. SOLUTION: A main rail 11 and an assist rail 10 supported in the side of the main rail by a supporting base 5 are provided in a track for truck traveling. An assist roller 16 is supported in a rack 15 for pivotally supporting a main rail roller part via a compression spring 9. Then, a floating roller 8 is provided so as to support the lower surface of a mounting base 4 following the up and down movement of the assist roller 16. A link 14 bulging to the side from the rock 15 of the truck and pivotally supported on rack 15 is provided. An assist roller case 17 is attached to this link 14 and the assist roller 16 contacted with an assist rail 10 is floatingly movable up and down. Thus, the balance of the mounting base is easily maintained.</p> |
